ATWOOD ON-DEMAND WATER HEATER
IOM ADDENDUM
04/24/2013
Modulating Valve Adjustment:
The modulating water valve will have a factory preset setting which is designed and tested for an approximate
60
⁰
F (33
⁰C)
rise in temperature for a hot water flow rate ranging from 1.00 GPM to 1.25 GPM as measured at
the water outlet (ie. faucet or shower head). The consumer is encouraged to set the modulating valve to provide
hot water in the 110
⁰
F-115
⁰
F (43
⁰C
- 46
⁰C
) range. The consumer can then add cold water to achieve the desired
hot water temperature. Care must be taken to prevent higher temperatures which may result in scalding. The
factory setting will satisfy most applications, however the modulating water valve has been designed with
flexibility in mind to handle a wide range of diverse situations. For hotter temperatures the modulating valve
can be adjusted counter-clockwise toward the MAX position; for cooler hot water temperatures, the modulating
valve can be adjusted clockwise toward the MIN position. One should use caution not to force the valve
adjustment beyond the MAX and MIN points.
Some factors relating to output performance are:
1.
City or Park Water Service incoming pressures.
2.
Obstructions or restrictions in the water system including water bypass valves in vehicles. The bypass
valve in your water system should be OFF during normal use.
3.
Use of flow restrictors in faucets and/or shower heads. Eliminate restrictors for best performance.
4.
Propane gas system pressure should be 11”w.c. while in operation. Be sure that LP tanks have plenty of
gas and are properly regulated. This should be verified by an authorized Atwood service technician.
For additional troubleshooting guidelines, please consult your owner’s manual MPD 90222.
If problems persist, please contact the nearest authorized Atwood Service Center or call Atwood Technical
Support at 1-866-869-3118.
Modulating Valve as viewed from exterior door
CAUTION:
Consult Owner’s Manual
before adjusting the Modulating Valve
MPD 90222
